Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e57b62c888380a…

MALICIOUS

PDF

34.6 KB Created: 2020-08-23 15:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e43c56ef746d0605f87b23e9826b468 SHA-1: 2b75038fdd4d9a79ff9e16f3706ed03daa5d6324 SHA-256: e2e57b62c888380a60c1e743be84803e5cce6110126f9da31c9ade862e0f7531
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many pointing to Shopify-hosted PDF files, which is indicative of a link farm or SEO manipulation tactic. One URL, 'https://ttraff.ru/pify?keyword=form%25C3%25A1t+bakal%25C3%25A1%25C5%2599sk%25C3%25A9+pr%25C3%25A1ce+muni', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=form%25C3%25A1t+bakal%25C3%25A1%25C5%2599sk%25C3%25A9+pr%25C3%25A1ce+muni
    • http://xoramixo.rosedaleyouthsoftball.com/uploads/1/3/1/0/131070450/f21b2.pdf
    • http://files.jasminkwan.com/uploads/1/3/1/4/131453248/kubomerebamel.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/baldi_free_game_no.pdf
    • https://cdn.shopify.com/s/files/1/0437/8771/4721/files/95727350483.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/raxoxebawimudopuxudutoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mejiwevabefi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8074/files/41209284020.pdf
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/getabarekopepe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/16283734543.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/wisunini.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004712.bin
b17a9af0c1c7ff365632429e51940026926f9293b28aafa145f079397c5a2914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4712 5740 bytes
font_01_sfnt_off00005979.bin
fb8116b5c521ef6d3f93959bd3ae97e1ed37bcf771f34322a6ad1770c2f5b638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5979 11424 bytes

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